电解
电极
碳酸氢盐
纳米-
材料科学
化学工程
无机化学
化学
复合材料
电解质
工程类
有机化学
物理化学
作者
Long Ma,Yang Wang,Min Zhang,Jun Li,Liang Zhang,Xun Zhu,Qian Fu,Qiang Liao
标识
DOI:10.1016/j.jpowsour.2025.236874
摘要
The use of alkaline gas flow cells for electrochemical CO 2 reduction reaction (CO 2 RR) has achieved industrial current density ( j > 200 mA/cm 2 ), but it still faces great challenges in operational stability due to salt precipitation. Direct electrolysis of CO 2 -saturated solution can effectively avoid the salt precipitation issue. However, the current density of the system is largely limited (usually <100 mA/cm 2 ) due to the low mass transfer of CO 2(aq) in aqueous solution and unsuitable electrode structure . Here we report a bipolar membrane (BPM) electrolyzer with a CO 2 -saturated bicarbonate solution feed, employing a self-supported nano Ag electrode instead of the widely used composite carbon electrode. At ambient temperature and pressure, we achieved a Faradaic efficiency of CO (FE CO ) up to 97.29 %, with a maximum j CO of 632.67 mA/cm 2 and stability exceeding of 350 h (FE CO > 90 %). These performance metrics surpass most of bicarbonate-fed electrolyzers and offer significant advantages compared to the electrolyzers using gaseous CO 2 feedstocks . In addition, the self-supported nano Ag electrode offers a simple preparation process compared to the composite carbon electrodes, making it advantageous for large-scale production.
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